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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '518414a0c6206ce8aa49a6e00c814f118539aac973bd1238ec99c32b4e6a8e72' 
  AND token = '3Brc6gpCgCq6EytpcmNtaQywiLa7mVnVQiI/DmOcZ+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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