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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ac6bcfee9c149bc326cb0dcb16458fe864ff5b8c8ebc16170ffb4287e4ad7a6' 
  AND token = 'H/qjUTSlBD/CcqBkDerVX6Zg8oE1vZaAA76HHcz3DCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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