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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6f80e16aea51579dfc8befa4a3f1e3cd623d91af3098ed8310e3fb9670673a2' 
  AND token = 'fWr14RMbV++OJG6z3yuUJGTSNmZojTFCin002Z9Plh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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