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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b27845771b866e31b4cdd9f3254a737051f996ddaa6cea6e7d5ced8bd280cfe9' 
  AND token = 'MPUg5L1N0HiFaTRdjl745b/McnIavMjyB8ikx6wps/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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