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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b39361fd828e447b63f9ab143ad801793faa222193e45d281e776eea2b5f9539' 
  AND token = 'D5mahQg+CoytAcsHc++ba3gC6++qZ4o/xLW8km0ZOGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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