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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '050a2511700c1c618f0187372a1139a2ec70121a10720ae58fe88833abca3c06' 
  AND token = 'X4ybqEMZul5f+T+ycHMwLIDetJ3WMR7w8tI21WCMbzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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