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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c9bd7cd0064668e1d39171a474dad29b5e0ee0bfb320f0025e24a9327be4235' 
  AND token = 'tzzoaxSt2LDmi5n0YyHAf0mtId6QnffsIOqgWb6XEIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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