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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6dfb7cb0093ecac7d90f3fd8e3a8918bab3f6ac30b202210c4fd373f5d689c4f' 
  AND token = 'z9T+sD5ZVtQCyiA8zDIs0JUUPHlSFEmwwtsaravElOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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