SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a5bc20efde72df36d71661a3eabff559244de093e66b3dbcd196d670b0208b1' 
  AND token = 'pYHsWok3/Soz5nh+w2oBDGqfkiQ8j3VZ7Gh9kVuc2dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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