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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '678f9fdfd4e1d8c8835a19c211bd2193e924fa99b4d3716101310a48d4632470' 
  AND token = 'DSfXBrUSWiWMlT/jcrdSV2i1PDaMvO+VocoWAlBsYJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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