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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '885ce683a06846107c8cbc273c4f770981d912d37f1a026638794626a46e6a60' 
  AND token = 'iDm0BUFvoqL0eUBJw21MBYTqxcRPiSLE8KwTaWrD4Sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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