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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4cc32819ff10744557efedfc7723379079f8c393c6307ffb6a1ce6fba0720c9f' 
  AND token = '5lpfBrxLkWfJ9FYvsXEQ/EzE0/UnAMyWbSZz7DNmKmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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