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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e2146ffd12af724f4900c8f666ff893a3593142402bdabe60e9c05e4f1e0ccf' 
  AND token = 'cAwBNLRKeVSHySc8e53QyIaUuUTw9wwq8wDWxO2zhqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}