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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0310c1b15706affa8e064c6c9466a3505ebb32f31e7136e525588505412e7e4a' 
  AND token = '3a371WuYmHsj1EBWv0ZAME3y0NfoAg5N8BgF3Um+27k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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