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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1edf39e9d7e580ac136869abcf274cdb07d5d2ba4bc604d64431f7b476788412' 
  AND token = 'mja3pEWNMrofJX/kjvdeLMcL29A5hHf6HfbUozpahes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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