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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '46e6f2dd15e5ec5dc42452b9d11c047c8aa7b5b8d41d819e144dfa9fbfb1bbf7' 
  AND token = '7ov6TpxsSVhyOuH/zv7T5WjFS+JCS8fThD+OOCDj1zQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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