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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd1f1cec3fc5ef842b1dc8b7894c346d02ab8177d7192f0bc5d03d41928d81c0' 
  AND token = '7p0cw5rGtqvFIgH82R+UvmgenZGtSCi3zdOG0yPG2ZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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