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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd1c7de0b21b99b9e28bae1c6ef5de500fc9c5dfa7df0d621ffe005f39645b21f' 
  AND token = 'jLw3gbVK6zgQot5G4rCufrMMpgepqEazTDNo6UrDYpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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