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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '183f1c623a4b59d85dc11fd2acaf5a06345e19ae7d7ca9be36164e2a56fae985' 
  AND token = 'p9lPGuimRTxi3T0kJ9Px2daNSF0KHNmyOuXkyRf/O48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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