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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dcba83f9f2c6c8e1ed16249f300835b761ea11ddb5dd0a1e2020947faab4129e' 
  AND token = 'PqWCdzH5HT9cvrUm2go7kAXSAd9t2kre60919Y2AT4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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