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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '57f8ee44bd52126ef1caccc48b5a8bd4a0c5bee4941c9bea6d49402e9db905d3' 
  AND token = 'xh8WOqUKuChksWSQTiJ3Z5Vt7wYTag11wdoANdiYH0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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