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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6021a4a3f0b427950aa13c9a73d44b80bce3a9faf5f717c8d966c2e634d6505' 
  AND token = 'g3QveD8xKCDiNDNp/ACbqX1rcbSxXwWwyTth1ILAjNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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