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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7714172380073b7d39d19195ad02579470a3261bfb9c7b1fa6bd3185d69dd61a' 
  AND token = 'JXfopBrfhM75PmU8jAapCDkhL3UQw5yqegogHk/kMk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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