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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9899ac96fddcd4fa073a334090ad6ba366be2d5d386d122529f5fd7b3ada9786' 
  AND token = '41Dxd1vCAv8D45P41HWkCqt5zXqjSe3G0vNA7PixWEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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