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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '57d30bd4778f10a48a03ab5f4d5b6c9a976155c7fff6fada56a34858b67e8929' 
  AND token = 'Cf3mspTcyOdVPblVDNPmOpJd0BiXiQII9xYvXuTWseA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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