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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '83a28988f6aff8025a9359d89541a375a662a42ea175f4b4d2a678912d4cb02d' 
  AND token = 'MM+4XiFBxlu540zHoefbn77WgbgyMEryq5xFaRNSG4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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