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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc71f4b987b8dbc380730166b3cb753d8ed6bdecff5a1406d21d26290e4d774f' 
  AND token = 'HWkcaJkPlxD2ED1VZ1y1E+Xncgt3TUcaUqnYwHkKCyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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