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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4fcdda126d79eb49e9cd50e18d486016c9f025569358c06d5cc51222c017a3cf' 
  AND token = 'cw9ohtSmDgj5nyz0863iVo4QwPDrsJDrqNoDZ0E71ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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