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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '45e98b8d2113853498d825df7b214fc74bad9ced9bd9bf929bb6223499b20cfb' 
  AND token = '0KlynHDQf20SQ+tDncoaKQx/aL4l0lLj8xEG6Iqloig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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