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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b74861c363324b5d0a6b93965da6b08b60db29875b35c014d6bbe014f78e9e8' 
  AND token = 'LwvmOrzb3L/+G8t2A3nhX9y1yAD9HliwIPLi0ZGAm7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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