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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02626f801df25dec3d2b9ce189ad988ae099e7faf198050b3748c0731cbb245d' 
  AND token = 'TZrrW9gJhJtuyD+TDYiLBFQOKJTiE+4nAa8ibnoJbCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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