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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca482f73971f1b8ae68d427f499a280f4d8be1afc088759c460581d9d3d86f28' 
  AND token = 'dqSSETIwrf4qRTFmn3XYEl4zqbMd9X/KHojaQpYQMTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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