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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '65f57cc2cd949a58fe7c9d03a2a74a567057057c5effe7afcd3d431afa682b30' 
  AND token = 'LHHdwl11QFRm93FuRoA5X43bk7+4pzgxAqHD+ut83Mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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