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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2a7c115246c4aecbb820690d4dac6689a76dd847c93f96ee9e7341ae54c12b8' 
  AND token = 'O599gzykB0hHy7z1UyeukzFWJrjyZLV73CEsX77C5Wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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