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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '540783560680969067a8096441c0c4fac67d20b5d0539f72ce5e0b2f240441e0' 
  AND token = 'AH6FG4HHKok5UQNN5K2uKcplUQ1c1fMMpWsgiuUp7ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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