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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e1e77d89ba5c17b71331f86eb41c6cde1d5da6046c1eb1e33766d50abccbaf2' 
  AND token = 'lm7hKjj0IGQ3kGvJwRvu2y+8Hvd2Hkcqas9ZACRbt4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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