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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99395f8a2dc14c054c9e1a5e72ef3ab2a428d16a6a8c7a5644abf232ef0d5fea' 
  AND token = 'nndyJWwIZV0xPo8lN7AnqWH8KhS+bfgrQ3NgQL2nklY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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