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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9cfdfaa2fadf440115845b81c1a033bffa256d6cabd74ab0ca11d5b5e5d308d7' 
  AND token = 'L00LvwXpgfI/4IH+NNwy499adtJTnw/zJc/u5kkuMoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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