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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '10b01933e73ad452528294c4d0f3bf7f5be6df66c10bb5dd02bac70081a12c55' 
  AND token = 'n3PsGJSk3nEEIBIM7wY2UyUE/bdZsLIlzI8OMbEtNNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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