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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ade8926ff5e6b7308904831d0d314f6f76ba85e8db1a7f1d0267315d4fd96172' 
  AND token = 'oITasG5suWv7mlu6c22QWtEjtYe70pPoIIMrLB9sgHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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