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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e747f67ce5a83857c4de3e52ced5aca2251723470c5fa1b59536e556e5312da' 
  AND token = 'xz5w6XBOkzdlTkYgJdLbBVYR9p7kCsZVwMf+EnmEZOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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