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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec905f758f9914e0ae203e1dc4a6c311a60bee6c19a4d2a09e3a32a213bd100c' 
  AND token = 'PgbKLm2A5zEbKw4Kf1Vh8l0qW1kRuk/NATlfBWMw6HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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