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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0d9f050e5cf80023413e9e682b8656d436077546f84bee30b94a58c14b44517' 
  AND token = 'Go4pBQfH8Yea2pFRnA4DKNfB7ehhy4WkmzlODhqrZJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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