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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f55ace8806cf8ad838a4ff3654686f0de45f9135f66cdbf691aadf0e0f6b7a6' 
  AND token = 'TQnoq4hTsDh04qVduQ1gwAhFh/gyP/nEOXjwOsb8SfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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