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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d6eda337cf72e2ae867b6d4099ecd33024fbdc63abae2959db922bede4b015d' 
  AND token = '4Q67qDxKgKrDI/0I0chm3S6MYi/g3ZAuxuquDQ/qgRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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