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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '70595246d2a1da6f771c3549e114a4b326891a329c594fd070d1969957bc0691' 
  AND token = '5OVObf96TADoxv6uDt1FgDuny1fTf2iQdfsGYHn2Vzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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