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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '31ff4611bfbb302073c037fe79d95d8e3e266540ccef5c9b442d28421f60bea7' 
  AND token = 'KH7KCDzlfjhS2N5iRwR6n+7aDjhE9Ai8PWTSbYEk8IU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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