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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '57674e1930414aed2072570efc23675806811ff424d94f7f742a456938203edd' 
  AND token = '09o2KUc66C/hlKL3Z1q384yg7RWKiN0QGmBLTAWBQLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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