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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '81ed2762cf10b64d32573a8fd6f4ce33a4906f63fed4a129ce365d8ae2b6d807' 
  AND token = 'PeDrBa2ebWpkr28mLNh1jSo7akLUWIYIoByMO825BE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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