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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9559d0869055d3135d68613e599dbfe73d15364c67844cd1d63101e7ff5572ff' 
  AND token = 'UO2STW5FszradxwraMGrDj67YMA3kP+pBOLSwdvuwz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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