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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f97413db34810f41bd779889ee4ee01a4fa02271c4a09dbaec89d5262bd49d3' 
  AND token = '9Vzu2EZPmseM4+7bevTte6RubzPX0eUFd4UV5hM3ix8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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