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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '319563c50feb2a7c2b7c3f4e5248457b10cbb1a538c24ca3ddcb0ffd2e365070' 
  AND token = '2YAqlp5U4G8Jd3O14UWZ6WB//F8g+cErc7cpzc0oDVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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